/*
 * Copyright 2020 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "include/private/base/SkTPin.h"
#include "modules/skottie/src/Adapter.h"
#include "modules/skottie/src/SkottieJson.h"
#include "modules/skottie/src/SkottiePriv.h"
#include "modules/skottie/src/SkottieValue.h"
#include "modules/skottie/src/layers/shapelayer/ShapeLayer.h"
#include "modules/sksg/include/SkSGGeometryEffect.h"

namespace skottie::internal {
namespace {
class OffsetPathsAdapter final : public DiscardableAdapterBase<OffsetPathsAdapter, sksg::OffsetEffect> {
public:
    OffsetPathsAdapter(const skjson::ObjectValue &joffset, const AnimationBuilder &abuilder,
        sk_sp<sksg::GeometryNode> child)
        : INHERITED(sksg::OffsetEffect::Make(std::move(child)))
    {
        static constexpr SkPaint::Join gJoinMap[] = {
            SkPaint::kMiter_Join, // 'lj': 1
            SkPaint::kRound_Join, // 'lj': 2
            SkPaint::kBevel_Join, // 'lj': 3
        };

        const auto join = ParseDefault<int>(joffset["lj"], 1) - 1;
        this->node()->setJoin(gJoinMap[SkTPin<int>(join, 0, std::size(gJoinMap) - 1)]);

        this->bind(abuilder, joffset["a"], fAmount);
        this->bind(abuilder, joffset["ml"], fMiterLimit);
    }

private:
    void onSync() override
    {
        this->node()->setOffset(fAmount);
        this->node()->setMiterLimit(fMiterLimit);
    }

    ScalarValue fAmount = 0, fMiterLimit = 0;

    using INHERITED = DiscardableAdapterBase<OffsetPathsAdapter, sksg::OffsetEffect>;
};
} // namespace

std::vector<sk_sp<sksg::GeometryNode>> ShapeBuilder::AttachOffsetGeometryEffect(const skjson::ObjectValue &jround,
    const AnimationBuilder *abuilder, std::vector<sk_sp<sksg::GeometryNode>> &&geos)
{
    std::vector<sk_sp<sksg::GeometryNode>> offsetted;
    offsetted.reserve(geos.size());

    for (auto &g : geos) {
        offsetted.push_back(abuilder->attachDiscardableAdapter<OffsetPathsAdapter>(jround, *abuilder, std::move(g)));
    }

    return offsetted;
}
} // namespace skottie::internal
